Researches of existing environmental state represent the basis of the researches for the needs of planning new activities or increasing existing activities in space, but also the basis for population’s health research and protection and maintains of areas with important natural and cultural-historic values. Investigations of air pollution and air quality fall into group of basic activities during describing and evaluating the total environmental state in certain area. This paper identifies the main sources of air pollution in the municipality of Loznica and, according to results of measured values of air pollutants (emission and imission values), concludes about air quality. It also proposes in the end mitigation measures for improvement of the air quality, and therefore of entire environment.